Answer:
Carbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy.
If the angle of reflection is 82 and the light ray strikes a flat mirror, what will the angle
if incidence be?
Answer:
82
Explanation:
According to law of reflection, the angle of incidence = angle of reflection
Answer:
The angle of incidence will be equal to the reflection.
Explanation:
The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection.
So 82 would be the answer.
a force of 200N is exerted horizontally on a box of mass 18kg to displace it through a distance of 6m.how much work is done. Please help me and I will make you as brainliest
Answer:
1200
Explanation:
W=FD
W= work done
F= Force
D= distance
So, 200*6=1200
One of the world's largest Ferris wheels, the Cosmo Clock 21 with a radius of 50.0 m is located in Yokohama City, Japan. Each of the sixty gondolas on the wheel takes 1.00 minute to complete one revolution when it is running at full speed. Note: Ignore gravitational effects. What is the centripetal acceleration of the gondola when the Ferris wheel is running at full speed
Answer:
a = 0.55 m / s²
Explanation:
The centripetal acceleration is given by the relation
a = v² / r
angular and linear velocities are related
v = w r
we substitute
a = w² r
In the exercise they indicate the angular velocity w = 1 rev/min, let's reduce to the SI system
w = 1 rev / min (2pi rad / 1rev) (1min / 60s) = 0.105 rad/ s
let's calculate
a = 0.105² 50.0
a = 0.55 m / s²
Help FAST PLSS!!!
What is the period of a wave with a wavelength of 8 cm and a frequency of 0.5 hertz?(1 point)
0.125 seconds
4 seconds
0.0625 seconds
2 seconds
Two ropes are identical. A wave traveling through the first rope has a frequency of 1.5 hertz and a wavelength of 6 meters. What is the frequency of a wave in the second rope if its wavelength is 2 meters?(1 point)
3 hertz
1.5 hertz
9 hertz
4.5 hertz
If the wavelength of a wave in a particular medium is tripled, what will happen to the frequency of the wave?(1 point)
It will become one third of its original value.
It will become triple its original value.
It will depend on the speed of the wave.
It will remain constant.
If the speed of sound in air is 340 m/s, approximately how long will it take the sound of a clap of thunder to travel 2 kilometers?(1 point)
3.4 seconds
2.9 seconds
1.7 seconds
5.9 seconds
In music, the note G above middle C has a frequency of about 392 hertz. If the speed of sound in the air is 340 m/s, what is the approximate wavelength of this note?(1 point)
8.7 meters
0.87 meters
0.0026 meters
1.2 meters
Answer:1.) 2 seconds
2.) 4.5 hertz
3.) it will become one third is original value
4.)5.9 seconds
5.)0.87 meters
Explanation:
1. The time period of wave is 0.125 second
2. The frequency of a wave in the second rope is 1.5 hertz.
3. The frequency will become one third of its original value.
4. the time taken by sound of a clap of thunder to travel 2 kilometers is 5.9 seconds.
5. The wavelength of note is 0.87 meter
1. Time period [tex]=\frac{1}{frequency} =\frac{1}{8} =0.125second[/tex]
2. Since both rope are identical. Therefore, both rope have same frequency.
Thus, The frequency of a wave in the second rope is 1.5 hertz.
3. In relation between wavelength and frequency, wavelength is inversely proportional to frequency.
If the wavelength of a wave in a particular medium is tripled , then the frequency of the wave will become one third of its original value.
4. The time taken by sound of a clap of thunder,
[tex]=\frac{2000}{340}=5.9seconds[/tex]
5. Wavelength is the ratio of speed to the frequency.
[tex]Wavelength=\frac{340}{392}=0.87meters[/tex]
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What's the name of the compound Cal2?
Answer:
The correct answer is calcium iodide.
Explanation:
Hope this helped Mark BRAINLIEST!!!
The compound with the chemical formula CaI₂ is called calcium iodide.
A compound is a substance formed when two or more elements chemically combine in specific proportions. It is characterized by a distinct chemical composition and properties that differ from the elements it is composed of. Compounds are held together by chemical bonds, which can be either ionic or covalent, depending on the nature of the elements involved.
Calcium Iodide (CaI₂):
Calcium iodide is an ionic compound composed of the elements calcium (Ca) and iodine (I). In this compound, calcium, which is a metal, donates two electrons to iodine, a non-metal, resulting in the formation of a calcium ion (Ca²⁺) and two iodide ions (I⁻). The ions are held together by electrostatic forces of attraction, forming a crystal lattice structure.
Calcium iodide is a white, crystalline solid that is highly soluble in water. It is commonly used in various applications, including as a catalyst in organic reactions, a source of iodine for nutritional supplements, and in the synthesis of pharmaceuticals.
Therefore, The correct answer is Calcium Iodide.
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Which best describes nuclear fusion?
A nucleus spontaneously splits and absorbs energy.
Two nuclei spontaneously combine and absorb energy.
A nucleus collides with a neutron and splits, releasing energy.
Nuclei combine to form a heavier nucleus, releasing energy.
Answer:
The statement that best describes nuclear fusion is;
Nuclei combine to form a heavier nucleus, releasing energy
Explanation:
In nuclear fusion, we have the reaction of the nuclei of two or more atoms coming together (combining) to form heavier elements and subatomic particles such as protons and neutrons accompanied by the release or absorption in energy depending on the difference between the mass of the reactants and the products
Some nuclear fusion reaction require an input of energy and such reactions are therefore not spontaneous
The best option is nuclei (two or more nuclei) combine to form a heavier nucleus, releasing energy.
Answer:
The answer is the last option or D
Explanation:
Nuclei combine to form a heavier nucleus, releasing energy.
Have a great day and stay safe!
Use the graph. Which time period was
the car moving the fastest?
Answer:
1,2,3,4
Explanation:
The spring constant for the spring in above Table is 20 N/m.
Calculate the work done in stretching the spring until the extension of the spring is
0.050m
Work done =____J
Question 19 (4 points) A 2-kg ball traveling in the y-direction (North) collides with a 6-kg ball, initially at rest. After the collision, the 6-kg ball is moving at 5 m/s, 53° West of North. The 2-kg ball is moving 37° East of North. 6 kg 530 5 m/s 379 VE 2 kg before 6 kg after 2 kg What was the initial speed of the small ball (before the collision)? 20 m/s 35 m/s 30 m/s 15 m/s 40 m/s 10 m/s 25 m/s
Question 4 of 10
Samples of different materials, A and B, have the same mass, but the sample
of B is higher in density. Which statement could explain why this is so?
A. The sample of material B has greater volume than the sample of
material A.
B. The particles that make up material A are more closely packed
together than the particles that make up material B.
C. The particles that make up material B are more closely packed
together than the particles that make up material A.
D. The particles that make up material A have more mass than the
particles that make up material B.
SUBMIT
Work is done when force is applied ____________________________________________?
Question options:
A. for a long period of time
B. in the opposite direction
C. in the same direction that the object moves
D. none of the above
Answer:
D none of the above
Explanation:
mark me brainlyest pls?
True or False: You can break apart the atoms in a polyatomic ion.
True
False
hey guys if anyone can help that would be amazing, this is due at noon
Answer:
a.45N
b.52.2N
c.36.45N
Explanation:
note:these answers are based on the fact that the acceleration due to gravity is 10m/s²
*.first of all the tension (T)in the cable is equivalent to the mass(m) of object multiplied by the sum of the opposite and parallel accelerations of the gravity and the elevator respectively.ie. g and a
now that being said mathematically the formula for tension in the cable is given by
T=m(g+a).
a).now for this situation the elevator is stationary,thus has not accelerated,
so a=0
then T=mg; where m=4.5kg g=10ms-²
therefore, T=4.5*10=45N.
b).here the elevator accelerated up, so a is positive.ie.+a
hence T=4.5(10+1.6)=52.2N.
c).here also the elevator accelerated down, so a is negative. is.-a
hence T=4.5(10-1.9)=36.25N.
I hope this will be of good help to you, you can contact me for further explanations or questions.
which is true of Pluto?
A. Pluto has a moon that is about half it's size.
B. Pluto's orbit is shorter than than Saturn's.
C. Pluto orbits the sun every 2.5 earth years.
D. Pluto is only larger than Mercury.
Answer:d
Explanation:
Probably becuase it is further than Saturn
It takes like 70 years to go around the sun
And it is bigger than the moon
Answer: pluto has a moon that is about half of its size.
Explanation: just because
An automobile starts at rest and accelerates at 57 m/s after a traffic light turns green.
How far will it have gone when it is traveling at 15 m/s?
An automobile accelerates at the rate of 57 m/s² with a final velocity of 15 m/s. Then, the distance covered by the automobile will be equal to 1.97 meters.
What is Acceleration?A moving object's speed and orientation vary over time at a certain rate, which is known as acceleration.
An object or location is considered to be accelerated when it moves more quickly or more slowly in a straight path. A circle's motion increases despite its constant speed because its direction is always changing. For all other motions, by and to velocity is used.
Because of its magnitude and direction, it is a vector quantity.
As per the given information in the question,
Acceleration, a = 57 m/s²
Final velocity, v = 15 m/s
Use the equation of motion,
v² - u² = 2as
Put the values in the equation,
15² - 0 = 2(57)(s)
s = 225/114
s = 1.97 meters.
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A sound wave has a frequency of 250 Hz and a wavelength of 1.3 m. Calculate the speed of this waves.
Answer:
325 m/s
Explanation:
Frequency of the wave = 250 Hz
wavelength of the wave = 1.3 m
From the wave formula;
v = λf
v = wave speed
λ = wavelength
f= frequency
v = 250 * 1.3 = 325 m/s
This glass of lemonade is sitting in the hot summer sun. As time passes, in which direction will heat transfer take place?
ОА.
ice
lemonade
B.
lemonade -- air
. C.
air
lemonade
D.
ice - straw
E.
ice - air
Answer:
it A.
Explanation:
did the test on Edmentum and got it right
Calculate the net force of the object in the image shown 20N 15 N
Write the word conduction, convection or radiation in the blanks in front of 1-13
1.
Walking on the hot sand on a beach
2.
A ceiling fan forcing the warm air downward.
3.
Feeling heat from a campfire.
Chocolate candy melting in your hand.
5.
Air in the atmosphere rising and falling.
6.
Heat from the sun warming a swimming pool.
7.
Changing a light bulb while it's still hot.
8.
Heat from the hood of a car when you touch it.
9.
Feeling the heat from a stove burner without touching it.
10.
Boiling water moving in a circular motion
11. Energy that is transferred in waves or particles.
12. Energy that is transferred by direct contact.
13. Energy that is transferred through a fluid where hot rises and cold
sinks.
Answer:
1. conduction
2. convection
3. radiation
4. conduction
5. convection
6. radiation
7. conduction
8. conduction
9. radiation
10. convection
11. radiation
12. conduction
13. convection
1. 20.0 mL of a liquid has a mass of 58.2 g. What is the density of the liquid?
The correct answer about density is 2.91 g/mL.
What is Density?The measure of how densely a substance is packed together is called density. In simple terms, we can say that density is mass per unit volume.It can be denoted by the symbols 'D' or 'ρ'.The formula of Density is ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.The SI unit Density is Kg/m³We can use g/cm³ for solids, g/ml for liquids, and g/L for gases for our convenience.
What are the Applications of Density?You may use separation procedures with the assistance of knowledge of the densities of two substances.For example, Oil leaks from an oil tank into the ocean, where the less dense oil drops begin to float on the sea.Another typical application of density is determining whether an object will float on water or not. Due of the disparity in densities, ships float and submarines dive.
How to solve this question?
Density = Mass / Volume
Density = 58.2 g / 20 mL
Density = 2.91 g/mL
Thus, we can conclude that by dividing mass of the object by volume of the object, we will find the density of the object.
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What do you hope to learn from participating in the activity you selected?
Answer:
I hope to learn the basic moves and stances of boxing. I understand that I won't be boxing with another person, but that’s OK. These exercises seem like a good starting point. I really want to understand how to put together combinations. I’ve seen professional boxers throw combinations on TV, but their hands move so quickly that I can’t catch the finer details of the sport. Maybe this will be an opportunity for me to find out more.
Explanation:
What's a Blackhole ?
Answer:
A black hole is a region of spacetime where gravity is so strong that nothing—no particles or even electromagnetic radiation such as light—can escape from it. The theory of general relativity predicts that a sufficiently compact mass can deform spacetime to form a black hole.
PLEASE HELP 40 POINTS
A car of mass 700 kg and moving at a speed of 30 m/s collides with a stationary truck of mass 1400 kg, and the two vehicles lock together on impact. The combined velocity of the car and truck after the collision is m/s.
Can someone please give me this answer to this please
The linear expansivity of metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to Q
If an acid and a base react, the product(s) will be ____.
A salt
Neutral water
A salt and water
A metal and water
what are the conditions for a body to be at equilibrium
Answer:
Explanation:
Conditions for equilibrium require that the sum of all external forces acting on the body is zero (first condition of equilibrium), and the sum of all external torques from external forces is zero (second condition of equilibrium). These two conditions must be simultaneously satisfied in equilibrium
which statement is true about the reaction shown by this chemical equation HCl + NaOH ------> NaCl + H2O
Answer:
Endothermic
Explanation:
Ap3x
This is the type of Neutralization reaction. So, the correct option is (B).
What is Neutralization reaction?
Neutralization is defined as a chemical reaction in which an acid and a base react quantitatively with each other. Neutrality results from the absence of an excess of hydrogen or hydroxide ions present in the solution.
In this, acid and base react quantitatively to form salt and water as products. In a neutralization reaction, H+ ions and OH- ions combine to form water.
For example,
HCl + NaOH → NaCl + H₂O
Thus, this is the type of Neutralization reaction. So, the correct option is (B).
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Your question is incomplete, most probably the complete question is :
Which statement is true about the reaction shown by this chemical equation HCl + NaOH ------> NaCl + H2O
1. Decomposition Reaction
2. Neutralization reaction
3. Combustion reaction
4. Synthesis reaction
a ball rolls off the edge of a balcony at 10 m/s. What is its speed after 1 s in the air
Answer:
V = 19.8 m/s
Explanation:
Given the following data:
Initial velocity = 10m/s
Time, t = 1 secs
We know that acceleration due to gravity is equal to 9.8m/s
To find the final velocity, we would use the first equation of motion;
[tex] V = U + at[/tex]
Where;
V is the final velocity.
U is the initial velocity.
a is the acceleration.
t is the time measured in seconds.
Substituting into the formula, we have;
V = 10 + 9.8*1
V = 10 + 9.8
V = 19.8 m/s
PLEASE HELP!
A 1500 kg car moves forward with 30 kg • m/s of
momentum. What is its velocity?
Select One:
a: -1470 m/s
b: 0.02 m/s
c: -50 m/s
d: 45,000 m/s
Answer: b
Explanation:
p=mv
p=30
m=1500
rearrange to find v
(30)=(1500)(v)
v= 30/1500
v = 0.02 m/s